北京航空航天大学学报 ›› 2007, Vol. 33 ›› Issue (01): 5-9.

• 论文 • 上一篇    下一篇

合成射流作用机理及其对共轴射流掺混的影响

刘艳明, 伍耐明, 董金钟, 周盛   

  1. 北京航空航天大学 能源与动力工程学院, 北京 100083
  • 收稿日期:2006-01-19 出版日期:2007-01-31 发布日期:2010-09-19
  • 作者简介:刘艳明(1976-),女,河南南阳人,博士后,liuym@buaa.e du.cn.

Process mechanism of synthetic jet and its effect on the mixing in coaxial jets

Liu Yanming, Wu Naiming, Dong Jinzhong, Zhou Sheng   

  1. School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2006-01-19 Online:2007-01-31 Published:2010-09-19

摘要: 对合成射流流场及其作用下的内、外涵共轴射流流场进行了二维非定常数值模拟, 研究了合成射流流场和共轴射流流场情况.结果表明,合成射流由一系列对称分布在中心线 2侧的旋涡对组成,频率与激振频率相同,对外场构成一扰动力;涡对自形成后向远处运移 速基本稳定;腔内和腔外涡对的形成及发展变化过程总体保持一致,在每时刻则呈现截然相 反的发展态势;中心线速度的降幅起伏变化分布是由激励器的激振变化引起的,体现了涡量 产生、发展变化的基本特征;合成射流激励器的采用可使共轴射流截面掺混率比未加激励时 得到增加,增强了共轴射流的掺混效果.

Abstract: Two-dimensional unsteady numerical simulation was carried out to inve s tigate the flowfields surrouding a synthetic jet actuator and its effect on the mixing in coaxial jets. The synthetic jet flowfield and the coaxial jets flowfie ld were investigated. The results show synthetic jet comprises a series of vorte x pairs, which distribute around the centerline symmetrically. Its frequency kee p same to the actuator′s frequency. This is a disturbed force for the outer flo w field. The movement velocity of vortex pairs is nearly constant. The formation a nd development of the outer flowfield have the same rule as that of the inner fl owfield. But they are opposite to each other at the certain moment. As a result of actuating device, the centerline velocity distribution shows that the amplitu de decreases gradually, which represents the radical characteristic of vorticity d evelopment. The mixing ratio of coaxial jets increases comparatively because of the synthetic jet actuators, and the mixing effects in coaxial jets also become more agreeable.

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